Oct 23

Why the teensy 3.5

3 comments

I was just curious as to why you went with the extra steps to add encoders to the steppers when StepperOnline has the proper drives and closed loop steppers already.

This project is exactly what I have been looking for in my machine shop to aid in production.

 

Great job!

Hello, thank you. The Stepperonline drivers/encoder combo doesn't have a method to feedback the step at which the failure occurred, its only an alarm output. I wanted to be able to monitor what the last executed step was so that I could recover the robots actual position. The encoders that stepper online have are differential quadrature encoders which are great for eliminating noise but to read in a quadrature encoder I would need a board with differential inputs so I opted for the very simple low cost CUI single ended AB encoders. The teensy 3.5 runs at 120mhz and all inputs are capable of interrupt for the encoders so I could monitor each axis position live. All that said I would still like to look at the Stepperonline encoder/driver combo some more and see if its possible to use the alarm output as an interrupt and capture current step possibly, havnt tried that yet but might be worth looking at.

Thank you very much for the quick reply. it is nice to have a complete and succinct reply. All of my experience through the years has been with servos. This is a new experience for me. I appreciate your clarifying the reasons for using this set up of steppers. Thank you and keep up the good work.

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